Tweco PAK 200i - Manual (Page 154)

PAK 200i
A-74 APPENDIX Manual 0-5335
407 Coolant Overheated due to High Ambient
As described in the section for codes 259-264 the CCM measures the ambient temperature using sensor TS2 and,
like with the inverters, if the coolant is over temperature we first check the ambient and if it is above 40 deg C
we attribute the cause of the coolant over temperature to high ambient and of course the solution is to lower
the ambient or reduce the duty cycle.
The other possibility is the ambient measuring circuit is defective and the coolant is overheated. In that case
you would have to go to the section for code 403 to find the cause of the coolant overheating and go to section
for codes 259-264 to determine what is wrong with the TS2 circuit.
The 5 Group relates to CANBUS (Fiber optic) communication errors
501 CANBUS Failure to Acknowledge fault.
The CCM communicates with the gas controls (except GCM 1000 XT) over a fiber-optic cable using the CANBUS
protocol. The CCM is looking for a signal from the gas control (GCM 2010 or DMC) over the fiber-optic link.
No signal has been detected. Communication with the DPC which is relayed through the DMC sets a different
code, 301, if there is a problem with it.
Possible causes:
• Unit is an Auto-Cut or PAK which has no fiber-optic, with Basic ID problem.
• CANBUS / Fiber-optic problem to either the GCM 2010 or the DMC (part of DFC 3000).
• Control Cable to DMC or GCM 2010 defective.
• Gas control (DMC or GCM 2010) main PCB blown fuse or defective.
• DMC power supply PCB blown fuse or defective.
• CCM defective.
Troubleshooting:
1. GCM 1000XT (also called a Basic Gas Control) does not use CANBUS (fiber-optic) communication. A jumper
in the gas control connector J56 pins 8 & 9, gives the signal “Basic ID” telling the CCM not to expect any
CANBUS. If somewhere this circuit is open, in the Gas Control cable, connector pins, connection from the
rear panel GCM connector, J55, to the CCM (J26) CCM will expect to see a CANBUS connection and report
this error because there is no CANBUS connected. AC 200 XT or PAK 200i with no separate gas control has
the jumper in J26-9&10 on the Relay board.
2. DFC 3000. If the gas control does not have power it will not communicate. Check for power to the gas
control boards.
a. When using Auto Gas (DFC3000) with DMC & DPC if there is no power to the DMC main board, the
green power light on the DMC front panel will not be lighted. The main board receives several voltages
from its separate power supply board. For communication it needs +5VDC. There is a green LED, D17
(first on the left of the row of LEDs.) that lights when the main board has +5V power.
b. The DMC power supply board has several blue LEDs that light when it has power. If none of these are
on check for the control cable being connected or the circuit breaker, CB�, on the plasma supply rear
panel may be tripped in which case there is probably a short somewhere.
c. The DMC power supply which supplies several voltages could be missing one or more and still have
some blue LEDs lighted. Check for voltages.
3. GCM �010.
4. CANBUS / Fiber-optic communication errors can be difficult to troubleshoot, especially when they are
intermittent. See “Test the Fiber” below. Things to look for are:
a. The connectors not locked in place at either end of the fiber.
b. The fiber is damaged or bent sharply. This should not be the case if the fiber is inside the protective hose
and the hose properly secured in the strain relief but that is not always the case.